/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import path from 'path';
import fs from 'fs';

export function findFiles(rootPath: string, ext: string[], files: string[] = []): string[] {
    let extSet = new Set<string>(ext);
    if (!fs.existsSync(rootPath)) {
        return files;
    }

    const realSrc = fs.realpathSync(rootPath);
    fs.readdirSync(realSrc).forEach((filename) => {
        const realFile = path.resolve(realSrc, filename);
        if (fs.statSync(realFile).isDirectory()) {
            findFiles(realFile, ext, files);
        } else {
            if ((extSet.size > 0 && extSet.has(path.extname(realFile))) || extSet.size === 0) {
                files.push(realFile);
            }
        }
    });
    return files;
}
